n-9=3n+7

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Solution for n-9=3n+7 equation: 



n-9=3n+7

We move all terms to the left:

n-9-(3n+7)=0

We get rid of parentheses

n-3n-7-9=0

We add all the numbers together, and all the variables

-2n-16=0

We move all terms containing n to the left, all other terms to the right

-2n=16

n=16/-2

n=-8

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